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1 | /*============================================================================= | |
2 | Copyright (c) 2001-2014 Joel de Guzman | |
3 | ||
4 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
5 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
6 | =============================================================================*/ | |
7 | #if !defined(SPIRIT_CALL_CONTEXT_MAY_26_2014_0234PM) | |
8 | #define SPIRIT_CALL_CONTEXT_MAY_26_2014_0234PM | |
9 | ||
10 | #include <type_traits> | |
11 | ||
12 | #include <boost/spirit/home/x3/support/context.hpp> | |
13 | #include <boost/spirit/home/x3/support/utility/is_callable.hpp> | |
14 | #include <boost/range/iterator_range.hpp> | |
15 | ||
16 | namespace boost { namespace spirit { namespace x3 | |
17 | { | |
18 | //////////////////////////////////////////////////////////////////////////// | |
19 | struct rule_val_context_tag; | |
20 | ||
21 | template <typename Context> | |
22 | inline decltype(auto) _val(Context const& context) | |
23 | { | |
24 | return x3::get<rule_val_context_tag>(context); | |
25 | } | |
26 | ||
27 | //////////////////////////////////////////////////////////////////////////// | |
28 | struct where_context_tag; | |
29 | ||
30 | template <typename Context> | |
31 | inline decltype(auto) _where(Context const& context) | |
32 | { | |
33 | return x3::get<where_context_tag>(context); | |
34 | } | |
35 | ||
36 | //////////////////////////////////////////////////////////////////////////// | |
37 | struct attr_context_tag; | |
38 | ||
39 | template <typename Context> | |
40 | inline decltype(auto) _attr(Context const& context) | |
41 | { | |
42 | return x3::get<attr_context_tag>(context); | |
43 | } | |
44 | ||
45 | //////////////////////////////////////////////////////////////////////////// | |
46 | namespace detail | |
47 | { | |
48 | template <typename F, typename Context> | |
49 | auto call(F f, Context const& context, mpl::true_) | |
50 | { | |
51 | return f(context); | |
52 | } | |
53 | ||
54 | template <typename F, typename Context> | |
55 | auto call(F f, Context const& context, mpl::false_) | |
56 | { | |
57 | return f(); | |
58 | } | |
59 | } | |
60 | ||
61 | template < | |
62 | typename F, typename Iterator | |
63 | , typename Context, typename RuleContext, typename Attribute> | |
64 | auto call( | |
65 | F f, Iterator& first, Iterator const& last | |
66 | , Context const& context, RuleContext& rcontext, Attribute& attr) | |
67 | { | |
68 | boost::iterator_range<Iterator> rng(first, last); | |
69 | auto val_context = make_context<rule_val_context_tag>(rcontext, context); | |
70 | auto where_context = make_context<where_context_tag>(rng, val_context); | |
71 | auto attr_context = make_context<attr_context_tag>(attr, where_context); | |
72 | return detail::call(f, attr_context, is_callable<F(decltype(attr_context) const&)>()); | |
73 | } | |
74 | }}} | |
75 | ||
76 | #endif |